Financial Instruments - Schedule of Pre-Tax Effect of Derivative Instruments and Related Hedged Items in a Fair Value Hedging Relationship (Details) - Interest rate contracts - Interest and other, net - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Earnings on Derivative	$ 0	$ 5	$ (11)	$ (43)
Gain (Loss) Recognized on Related Hedged Item	$ 0	$ (5)	$ 11	$ 43